Surge arrestor



Sept. 20, 1966 G. w. REZNOR 3,273,597

SURGE ARRESTOR Filed Jan. 29, 1964 mvsmoa FIG-5 GEORGE w. REZNOR BY IATTORNEY United States Patent 3,273,597 SURGE ARRESTOR George W. Reznor,Mercer, Pa., assimior to International Telephone and TelegraphCorporation, a corporation of Maryland Filed Jan. 29, 1964, Ser. No.341,040 3 Claims. (Cl. 13830) This invention relates to devices forarresting surges in the pressure of a fluid delivered by a pump or thelike, and has particular reference to a surge arresting device which canbe simply and readily connected into a pres sure line carrying a pulsingfluid.

The device according to the present invention finds a particularapplication in smoothing out the pulses resulting from the output of ahigh pressure pump, such as may be employed to deliver fuel oil to aburner. In such application the device has the function of eliminatingburner pulsation.

The device according to the present invention consists of a long nipplehaving end caps defining a casing enclosing a capsule formed of anenvelope containing a quantity of compressible gas such as Freon R-l3.The end caps are provided with suitable structure for inserting theassembly into the pressure line. The envelope containing thecompressible gas is rolled upon itself within the nipple in such amanner as to leave a passage therethrough offering no impedance to theflow of the pressure fluid, and at the same time presenting a largecompliant surface for the absorption of the pressure pulses.

With the foregoing considerations in mind it is a principal object ofthis invention to provide an improved surge arrestor adapted to beconnected into a pressure line having a pulsating column of liquidmoving therein, for the purpose of smoothing out the pulsations in theline, such surge arrestor being characterized by a gas filled envelopefolded or coiled upon itself and presenting a large compliant surface tothe pulsing fluid column, and offering no substantial impedance to theflow of the pressure fluid.

Other objects and important features of the invention will be apparentfrom a study of the following specifications taken with the drawing,which together describe and illustrate a preferred embodiment of theinvention, and the best mode of practicing the principles thereof. Otherembodiments may be suggested to those having the benefit of theteachings herein, and such other embodiments are intended to be reservedespecially as they fall within the scope and purview of the subjoinedclaims.

In the drawing:

FIG. 1 is an elevational view of a surge arrestor embodying theimprovements according to the present invention;

FIG. 2 is a longitudinal sectional view through the surge arrestor seenin FIG. 1;

FIG. 3 is a transverse section taken along the line 33 of FIG. 2,looking in the direction of the arrows;

FIG. 4 is a perspective view showing a portion of an envelope adapted toenclose a quantity of compressible gas; and

FIG. 5 is an end view of the envelope seen in FIG. 4.

Referring now to the drawing, the improved surge arrestor according tothe present invention is referred to generally by the reference numeral10, and includes a hollow cylindrical member or nipple 11 which isthreaded at each end as at 12 and 13. Respective knurled closures 14 and16 are adapted to be threaded to the member 11, and each of the closures14 and 16 is drilled and tapped at 17, so that the assembly thus fardescribed can be connected into a pressure line 1-8.

The hollow cylindrical body member has its internal diametersubstantially larger than the internal diameter of the pressure line 18,and the hollow body member or nipple 11 is adapted to enclose acompliant capsule indicated generally by the reference numeral 20.Capsule 20 consists of a pair of sheets 21 and 22 made of membranes orfilm material cemented or heat sealed along their margins 23. [Forexample, material from which the sheets 21 and 22. may be made is nylonor the like. Prior to the final sealing of the capsule 20 along itsedges 23 a quantity of a compressible gas such as Freon R-13 is placedtherein. In the embodiment shown in the several views hereinapproximately 43 cc. of Freon R-13 is inserted into the capsule 20. Insuch example, the capsule is formed by two /2" x 5" pieces, each beingapproximately .003" in thickness. The nipple member 1 1 for such size ofcapsule 20 may be of the order of approximately 6" in length, with aninside diameter of 1".

As seen particularly in *FIG. 3, the capsule 20 formed as described isfolded or coiled upon itself so as to leave in such folding or coiling alengthwise passage 24 posing substantially no restriction or impedanceto the flow of the pulsating column of liquid. The gas within thecapsule 20 is indicated by the letter G, and the pulsing of the liquidcolumn within the body member '11 causes the capsule 20 to alternatelycompress and expand to smooth out the pulsations within the pressurefluid.

The invention has been described in terms of a preferred embodimentthereof, but the scope thereof is intended to be limited only by theclaims here appended.

I claim:

1. A surge arrestor adapted to be connected in a pressure lineconducting a column of pulsating liquid for smoothing out the pulses insaid column of liquid, said arrestor comprising a casing defined by asubstantially hollow cylindrical member having an internal diametersubstantially larger than the internal diameter of said pressure line,means closing the ends of said casing and affording means for connectingsaid easing into said pressure line with the longitudinal axis of saidcasing extending coincident with the axis of said pressure line, and ayielding capsule contained within said casing for absorbing the pulsesof said column of liquid, said capsule being formed of a pair of spacedapart compliant membranes joined in spaced apart sealed relationship andhaving a quantity of compressible gas held therebetween, said capsulebeing coiled upon itself and confined in said coiled condition by thesaid casing and presenting in such coiled condition a passage formovement of said pulsing column of liquid and a large compliant surfaceto said liquid.

2. A surge arrestor adapted to be connected in a pressure lineconducting a column of pulsating liquid for smoothing out the pulses insaid column of liquid, said arrestor comprising a casing defined by asubstantially hollow cylindrical member having an internal diametersubstantially larger than the internal diameter of said pressure line,means closing the ends of said casing and affording means for connectingsaid easing into said pres sure line with the longitudinal axis of saidcasing extending coincident with the axis of said pressure line, and ayielding capsule contained within said casing for absorbing the pulsesof said column of liquid, said capsule being formed of a pair of spacedapart compliant membranes having a quantity of compressible gas heldtherebetween, said capsule being coiled upon itself and confined in saidcoiled condition by the said casing and presenting in such coiledcondition a passage for movement of said pulsing column of liquid and alarge compliant surface to said liquid.

3. A surge arrestor adapted to be connected in a pressure lineconducting a column of pulsating liquid for smoothing out the pulses insaid column of liquid, said arrest'or comprising a casing defined by asubstantially hollow cylindrical member having an internal diametersubstantially larger than the internal diameter of said pressure line,means closing the ends of said casing and affording means for connectingsaid easing into said pressure line, and a yielding capsule containedwithin said casing for absorbing the pulses of said column of liquid,said capsule being formed of a pair of spaced apart complaint membranesand having a quantity of 10 compressible gas held therebetween, saidcapsule being coiled upon itself and confined in said coiled conditionby the said casing and presenting in such coiled condition a passage formovement of said pulsing column of liquid and a large compliant surfaceto said liquid.

References Cited by the Examiner UNITED STATES PATENTS 2,261,948 11/1941Beach 138-30 X FOREIGN PATENTS 848,978 9/ 1960 Great Britain.

LAVERNE D. GEIGER, Primary Examiner.

T. MOORHEAD, Examiner.

1. A SURGE ARRESTOR ADAPTED TO BE CONNECTED IN A PRESSURE LINE CONDUCTING A COLUMN OF PULSATING LIQUID FOR SMOOTHING OUT THE PULSES IN SAID COLUMN OF LIQUID, SAID ARRESTOR COMPRISING A CASING DEFINED BY A SUBSTANTIALLY HOLLOW CYLINDRICAL MEMBER HAVING AN INTERNAL DIAMETER SUBSTANTIALLY LARGER THAN THE INTERNAL DIAMETER OF SAID PRESSURE LINE, MEANS CLOSING THE ENDS OF SAID CASING AND AFFORDING MEANS FOR CONNECTING SAID CASING INTO SAID PRESSURE LINE WITH THE LONGITUDINAL AXIS OF SAID CASING EXTENDING COINCIDENT WITH THE AXIS OF SAID PRESSURE LINE, AND A YIELDING CAPSULE CONTAINED WITHIN SAID CASING FOR ABSORBING THE PULSES OF SAID COLUMN OF LIQUID, SAID CUPSULE BEING FORMED OF A PAIR OF SPACED APART COMPLIANT MEMBRANDES JOINED IN SPACED APART SEALED RELATIONSHIP AND HAVING A QUANTITY OF COMPRESSIBLE GAS HELD THEREBETWEEN, SAID CAPSULE BEING COILED UPON ITSELF AND CONFINED IN SAID COILED CONDITION BY THE SAID CASING AND PRESENTING IN SUCH COILED CONDITION A PASSAGE FOR MOVEMENT OF SAID PULSING COLUMN OF LIQUID AND A LARGE COMPLIANT SURFACE TO SAID LIQUID. 